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Near‐Infrared Saturable Absorption of Defective Bulk‐Structured WTe2 for Femtosecond Laser Mode‐Locking
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2016-09-12 , DOI: 10.1002/adfm.201602664
Joonhoi Koo 1 , Young In Jhon 2 , June Park 3 , Junsu Lee 1 , Young Min Jhon 2 , Ju Han Lee 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2016-09-12 , DOI: 10.1002/adfm.201602664
Joonhoi Koo 1 , Young In Jhon 2 , June Park 3 , Junsu Lee 1 , Young Min Jhon 2 , Ju Han Lee 1
Affiliation
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Mono‐ and few‐layer transition metal dichalcogenides (TMDCs) have been widely used as saturable absorbers for ultrashort laser pulse generation, but their preparation is complicated and requires much expertise. The possible use of bulk‐structured TMDCs as saturable absorbers is therefore a very intriguing and technically important issue in laser technology. Here, for the first time, it is demonstrated that defective, bulk‐structured WTe2 microflakes can serve as a base saturable absorption material for fast mode‐lockers that can produce femtosecond pulses from fiber laser cavities. They have a modulation depth of 2.85%, from which stable laser pulses with a duration of 770 fs are readily obtained at a repetition rate of 13.98 MHz and a wavelength of 1556.2 nm, which is comparable to the performance achieved using mono‐ and few‐layer TMDCs. Density functional theory calculations show that the oxidative and defective surfaces of WTe2 microflakes do not degrade their saturable absorption performance in the near‐infrared range, allowing for a broad range of operative bandwidth. This study suggests that saturable absorption is an intrinsic property of TMDCs without relying on their structural dimensionality, providing a new direction for the development of TMDC‐based saturable absorbers.
中文翻译：
飞秒激光锁模的缺陷大体积结构WTe2的近红外饱和吸收
单层和很少层过渡金属二硫化碳（TMDC）已被广泛用作可产生超短激光脉冲的饱和吸收剂，但它们的制备很复杂，需要很多专业知识。因此，将散装结构的TMDC用作可饱和吸收体是激光技术中一个非常引人入胜且在技术上很重要的问题。在这里，首次证明了有缺陷的散装结构WTe 2微米薄片可以用作快速锁模器的基础可饱和吸收材料，该锁模器可以从光纤激光腔中产生飞秒脉冲。它们的调制深度为2.85％，从中可以轻松以13.98 MHz的重复频率和1556.2 nm的波长获得持续时间为770 fs的稳定激光脉冲，这与使用单脉冲和少量脉冲所获得的性能相当。层TMDC。密度泛函理论计算表明WTe 2的氧化和缺陷表面微米薄片不会在近红外范围内降低其饱和吸收性能，因此可提供广泛的工作带宽。这项研究表明，可饱和吸收是TMDC的固有特性，而不依赖于它们的结构尺寸，这为基于TMDC的可饱和吸收剂的发展提供了新的方向。
更新日期：2016-09-12
中文翻译：
飞秒激光锁模的缺陷大体积结构WTe2的近红外饱和吸收
单层和很少层过渡金属二硫化碳（TMDC）已被广泛用作可产生超短激光脉冲的饱和吸收剂，但它们的制备很复杂，需要很多专业知识。因此，将散装结构的TMDC用作可饱和吸收体是激光技术中一个非常引人入胜且在技术上很重要的问题。在这里，首次证明了有缺陷的散装结构WTe 2微米薄片可以用作快速锁模器的基础可饱和吸收材料，该锁模器可以从光纤激光腔中产生飞秒脉冲。它们的调制深度为2.85％，从中可以轻松以13.98 MHz的重复频率和1556.2 nm的波长获得持续时间为770 fs的稳定激光脉冲，这与使用单脉冲和少量脉冲所获得的性能相当。层TMDC。密度泛函理论计算表明WTe 2的氧化和缺陷表面微米薄片不会在近红外范围内降低其饱和吸收性能，因此可提供广泛的工作带宽。这项研究表明，可饱和吸收是TMDC的固有特性，而不依赖于它们的结构尺寸，这为基于TMDC的可饱和吸收剂的发展提供了新的方向。
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